LRA-225 Week 3 notes

Question 1

define paranasal sinuses

Answer 1

• large air-filled cavities
• also called accessory nasal sinus (due to being lined with mucous membranes)

Question 2

what are the 4 groups of paranasal sinuses?

Answer 2

• frontal
• maxillary
• sphenoid
• ethmoid

Question 3

who do the paranasal sinuses communicate with?

Answer 3

• sinuses communicate with each other
• communicate with the nasal cavity

Question 4

how many sinuses are in the maxillary bones?

Answer 4

2

Question 5

how many sinuses are in the frontal bone?

Answer 5

2

Question 6

how many sinuses are in the ethmoid bone?

Answer 6

several

Question 7

how many sinuses are in the sphenoid bone?

Answer 7

1 or 2

Question 8

which sinuses are only part of the facial bone structures?

Answer 8

maxillary sinuses

Question 9

which sinuses are contained in their respective cranial bones?

Answer 9

• frontal
• ethmoid
• sphenoid

Question 10

what is the purpose of the paranasal sinus?

Answer 10

• vocal resonance
• lighten the weight of the skull
• produce mucous (to moisten the nasal passageways and air entering the nasal airway)

Question 11

which paranasal sinus is developed, or shown, at birth?

Answer 11

maxillary sinuses

Question 12

which paranasal sinuses are developed at ages 6-7?

Answer 12

• frontal and sphenoid sinuses

Question 13

which paranasal sinus is developed last?

Answer 13

ethmoid sinus

Question 14

which is the largest paranasal sinus?

Answer 14

maxillary sinus

Question 15

what is another name for the maxillary sinus?

Answer 15

• antrum
• antrum of highmore

Question 16

what is the shape of the maxillary sinus?

Answer 16

• pyramid (frontal view)
• cube (lateral view)

Question 17

what are the dimensions of the maxillary sinuses?

Answer 17

• vertical: 1-1 1/2 inches
• 1 inch

Question 18

what is the site of communication of the maxillary sinus?

Answer 18

• opening into the middle nasal meatus
• located at the superior medial aspect of the sinus cavity

Question 19

why is erect preferred when positioning for a sinus view?

Answer 19

When a person is erect, any mucus or fluid trapped within the sinus tends to remain there and layer out, forming an air-fluid level

Question 19

where is the frontal sinus located?

Answer 19

between the inner and outer tables of the skull, posterior to the glabella

Question 19

true or false: frontal sinuses are rarely symmetric

Answer 19

true

Question 20

what separates the frontal sinuses?

Answer 20

• nasal septum??

Question 21

are frontal sinuses larger in men or women?

Answer 21

men

Question 22

where are the ethmoid sinuses located?

Answer 22

within the lateral masses or labyrinths of the ethmoid bone

Question 23

how does the ethmoid sinuses look when in a lateral view?

Answer 23

appear to fill in the orbits

Question 24

where are the sphenoid sinuses located?

Answer 24

lie in the body of the sphenoid bone directly below the sella turcica

Question 25

what is the shape of the sphenoid body?

Answer 25

cubic, divided by a thin septum to form two cavities

Question 26

true or false: Because the sphenoid sinuses are so close to the base or floor of the cranium, sometimes pathologic processes make their presence known by their effect on these sinuses

Answer 26

true

Question 27

define sphenoid effusion

Answer 27

a basal skull fracture and that either blood or cerebrospinal fluid is leaking through the fracture into the sphenoid sinuses

Question 28

what sinuses make up the osteomeatal complex?

Answer 28

- frontal - maxillary - ethmoid

Question 29

define sinusitis

Answer 29

an infection of either the frontal, maxillary, or ethmoid sinus

Question 30

what are the 2 key passages?

Answer 30

infundibulum and middle nasal meatus